Abstract
Galactic transient black hole candidate (BHC) MAXI J1535-571 was discovered on 2017 September 02 simultaneously by MAXI/GSC and Swift/BAT instruments. It has also been observed by India’s first multi-wavelength astronomy-mission satellite AstroSat, during the rising phase of its 2017-18 outburst. We make both the spectral and the temporal analysis of the source during 2017 September 12–17 using data of AstroSat’s Large Area X-ray Proportional Counter (LAXPC) in the energy range of 3–40 keV to infer the accretion flow properties of the source. Spectral analysis is done with the physical two-component advective flow (TCAF) solution-based fits file. From the nature of the variation of the TCAF model fitted physical flow parameters, we conclude and confirm that the source was in the intermediate spectral state during our analysis period. We observe sharp type-C quasi-periodic oscillations (QPOs) in the frequency range of \(\sim 1.75\mbox{--}2.81\text{ Hz}\). For a better understanding of the nature and evolution of these type-C QPOs, a dynamic study of the power density spectra is done. We also investigate the origin of these QPOs from the shock oscillation model. We find that non-satisfaction of Rankine-Hugoniot conditions for non-dissipative shocks and not their resonance oscillations is the cause of the observed type-C QPOs.
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Acknowledgement
We acknowledge the strong support from Indian Space Research Organization (ISRO) for successful realization and operation of AstroSat mission. This work makes use of archived data from Indian Space Science Data Centre (ISSDC). We acknowledge Prof. H. M. Antia and T. B. Katoch for their help and constructive suggestions regarding the data analysis and improvement of the manuscript. D.C. and D.D. acknowledge support from DST/SERB sponsored Extra Mural Research project (EMR/2016/003918) fund. Research of D.D. and S.K.C. is supported in part by the Higher Education Dept. of the Govt. of West Bengal, India. A.B. and A.B. acknowledge the support fellowship of the S. N. Bose National Centre for Basic Sciences, Kolkata,India. K.C. acknowledges support from DST/INSPIRE (IF170233) fellowship. R.B. acknowledges support from CSIR-UGC NET qualified UGC fellowship (June-2018, 527223). S.K.N., D.D. and S.K.C. acknowledge partial support from ISRO sponsored RESPOND project (ISRO/RES/2/418/17-18) fund. H.-K. C. is supported by MOST of Taiwan under grants MOST/106-2923-M-007-002-MY3 and MOST/108-2112-M-007-003.
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Chatterjee, D., Debnath, D., Jana, A. et al. AstroSat observation of non-resonant type-C QPOs in MAXI J1535-571. Astrophys Space Sci 366, 82 (2021). https://doi.org/10.1007/s10509-021-03988-6
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DOI: https://doi.org/10.1007/s10509-021-03988-6